I could use a balanced four-pole A/B switch box. That's two positions, A or B, each with four sets of balanced inputs. Selected input set goes to four sets of outputs. This could be described as a 4-pole, double-throw switch. Each pole wants to be balanced, so in terms of contacts, its an 8PDT switch. XLR or 1/4'' TRS, doesn't matter.
BALANCED INPUTS:
Position A: IN1, IN2, IN3, IN4
Position B: IN1, IN2, IN3, IN4
BALANCED OUTPUT:
Selected position (input A or B): OUT1, OUT2, OUT3, OUT4
Yeah, it's an odd item. I hope my description makes sense. Something rack mount would be good.
Thanks, guys.